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Geometry Vocabulary

Read the definition and type the term it defines.

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Quiz by arjaygee
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Last updated: February 15, 2024
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First submittedFebruary 15, 2024
Times taken39
Average score56.0%
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Hint
First
Letter
Answer
An angle whose measure is between 0 degrees and 90 degrees.
A
Acute angle
Two angles whose sum is 90 degrees.
C
Complementary angles
Segments that have the same length.
C
Congruent segments
Points that lie in the same line.
C
Collinear points
Points that lie on the same plane.
C
Coplanar points
A triangle with all angles congruent.
E
Equiangular triangle
A triangle with at least two sides congruent.
I
Isosceles triangle
A set of points with infinite length, but no width or height. Named using a lower case letter or any two points on the line.
L
Line
Points that do not lie on the same line.
N
Noncollinear points
Points that do not lie on the same plane.
N
Noncoplanar points
An angle whose measure is greater than 90 degrees but less than 180 degrees.
O
Obtuse angle
Coplanar lines that do not intersect.
P
Parallel lines
A set of points with infinite length and width, but no height. Often named using a capital letter in script.
P
Plane
An abstract idealization (without size) of an exact position in physical space. Represented by a dot and named using a capital letter.
P
Point
A statement that describes a fundamental relationship between basic terms of geometry and is accepted as true without proof.
P
Postulate
A logical argument in which each statement made is supported by a statement that is accepted as true.
P
Proof
In a right triangle, the sum of the areas of the squares on the legs is equal to the area of the square on the hypotenuse: a2 + b2 = c2
P
Pythagorean Theorem
A line that contains a single endpoint and extends infinitely in one direction.
R
Ray
An angle whose measure is 90 degrees.
R
Right angle
A triangle with no sides congruent.
S
Scalene triangle
A part of a line that consists of two endpoints and all the points between them.
S
Segment
An angle whose measure is 180 degrees.
S
Straight angle
Two angles whose sum is 180 degrees.
S
Supplementary angles
A statement or conjecture that can be proved to be true based on known and proved facts.
T
Theorem
The figure formed by three segments joining three noncollinear points.
T
Triangle
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